Syntax
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LONGBLOB

Description
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A BLOB column with a maximum length of 4,294,967,295 bytes or 4GB (232 - 1).
The effective maximum length of LONGBLOB columns depends on the configured
maximum packet size in the client/server protocol and available memory. Each
LONGBLOB value is stored using a four-byte length prefix that indicates the
number of bytes in the value.

Oracle Mode
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MariaDB starting with 10.3
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In Oracle mode from MariaDB 10.3, BLOB is a synonym for LONGBLOB.

URL: https://mariadb.com/kb/en/longblob/